Templot Club Archive 2007-2020                             

topic: 358Industrial turnouts and Templot
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posted: 10 Mar 2008 03:40

from:

Edward
 
 

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I'd appreciate any pointers in helping me fit a templot template onto the ringed turnout in the attached image from an early OS map. My attempt -copied at the end of this post- has managed to align with the entry and exit tracks but has a toe-to-heel length in 4mm/ft of 290mm. I should say that the original trackplan is a series of harbour lines (5'3" gauge or 21mm in 4mm/ft) with short loose-heel inset turnounts and sharp curves but my turnout design is more akin to the graceful lines of main-line practice.

I have tried a customised turnout  but I still cannot get a shorter turnout that matches the geometry. I'm assuming that in the OS map the line across the track in the approach to the turnout is the tie-bar?

(BTW the lower left-hand corner of the map is at (1800mm,0mm)

Thanks

Edward


    21    no-name
[size= ]

 Irish LPHC  GWR  14 ft. heel -  7.88   LH
[size= ]

--------------------------------------------------------------
[size= ]

     Information  about  this  template :
[size= ]

( all dimensions in millimetres )
[size= ]

template generated at 21:46:37 on 09/03/2008 using Templot v:0.91.c
scale = 4.0 mm/ft     scale ratio = 1:76.2
track gauge = 21.0    flangeway gap = 0.73
template: curved (constant radius)
rail head only (bullhead): rails vertical
------------
LH turnout:
GWR  14 ft. heel switch (curved) left-hand switch (joggled)
1 in 7.88 RAM regular crossing ( 1 in 7.91 CLM )
equalized-incremental timbering
------------
track centre-line radius = [ -6670.33] (constant radius)
resultant switch radius (centre-line) = 8774 approx.
resultant turnout radius (centre-line) = 3845 approx.
------------
adjacent track centres main side = 44.67
adjacent track centres turnout side = 44.67
------------
equivalent straight template dimensions BEFORE curving :
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 overall template length = 383.58
 blanked length = 0   ( visible length = 383.58 )
 approach/exit track in  45 ft rails / 19 sleepers per length ( rail length = 180.0 ):
 approach track length = 0
 exit track length = 12.67 ( 0 full rail lengths + 2 sleepers in 7.04 % of a rail length )
[size= ]

 switch radius (rail gauge-face) = 3800.0
 turnout radius (rail gauge-face) = 2449.66
 entry straight (curve-end to fine-point) = 11.47
[size= ]

 switch front (rail-joint to tips) = 21.33
 virtual lead (tips to fine-point) = 292.09
 actual lead (tips to blunt nose) = 294.08
 blunt nose to timber A = 1.33
 width of blunt nose = 0.25
[size= ]

 wing rail reach length (main-side) = 16.0
 wing rail reach length (turnout-side) = 16.0
 check rail overall length (main-side) = 52.0
 check rail overall length (turnout-side) = 52.0
------------
minimum radius on this template = 3845 mm ( 151 " )
total angular swing on this template = [ -3.29] degrees ( [ -1 in 17.37] RAM ) (in main road)
------------
nominal gauge :   custom-a    custom settings (a)
------------
template location on pad :
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rotation :  X = 0   Y = 24.0   K = [ -353.47] degrees ( 1 in 8.73 RAM )
  shift :  X = 2939.77   Y = 195.81
[size= ]

    peg :  X = 3249.99   Y = 269.06   K = [ -356.16] degrees ( 1 in 14.89 RAM )
rail-end :  X = 2939.77   Y = 219.81
[size= ]

radial centre :  X = 3697.59   Y = [ -6396.76]
track centre-line radius at peg = n/a (peg off MS centre-line)
internal geometrical radius = 4329.49 ( 170.45 " )
external geometrical radius (substitution radius) = 7497.88 ( 295.19 " )
[size= ]

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--------------------------------------------------------------
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Memo:   your memo notes for this template ...
[size= ]

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____________
[size=v: 0.91.c]
  ©

Attachment: attach_245_358_img312.gif 167

posted: 14 Mar 2008 09:13

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Edward wrote:
I'd appreciate any pointers in helping me fit a Templot template onto the ringed turnout in the attached image from an early OS map. My attempt -copied at the end of this post- has managed to align with the entry and exit tracks but has a toe-to-heel length in 4mm/ft of 290mm.

I should say that the original trackplan is a series of harbour lines (5'3" gauge or 21mm in 4mm/ft) with short loose-heel inset turnouts and sharp curves but my turnout design is more akin to the graceful lines of main-line practice.

Hi Edward,

I think you are placing too much reliance on the accuracy of 25" OS maps. They can only really be regarded as a rough guide. For detailed design you need a much larger scale, such as the Railway's own 40ft/inch plans.

All I can see of the ringed turnout is a black smudge! :)

Using your scan I have created a quick matching plan:

irish_harbour.pngirish_harbour.png

I scaled the scan to match your marked dimension of 2322mm.

The crossing angles are 1:4, 1:4.5, 1:5 and 1:6, which are all typical industrial sizes. The ringed turnouts are both 1:6 with 12ft straight switches. All the other turnouts have 9ft switches.

The .box file is attached but would need some further work. Most of the alignments were done manually by eye only just as a quick exercise to see what might fit.

regards,

Martin.
Attachment: attach_249_358_irish_harbour.box 187

posted: 14 Mar 2008 14:01

from:

Edward
 
 

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Martin

deus ex machina! perhaps that should be your motto

Thanks

Edward



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